In Many Mediterranean countries, swallows and maritns are mostly welcome. They bring happiness early in spring, they fill the air with their happy calls and they feed on huge ammounts of mosquitos and other insects. However, in some villages and cities, people try to get rid of their nest because of the "dirty" look of the muddy nests on the walls.
This book tries to change the mind of people to be kind and hostile to these beautiful and useful birds.
It is telling the story of three friends who decided to stop the habit of washing and destroying the nests.